Type
Zone
Age range
40–38.1 Ma
G. semiinvoluta HOZ
M. crassatus HOZ
O. beckmanni TRZ
G. semiinvoluta HOZ
M. crassatus HOZ
O. beckmanni TRZ
40.039.939.839.739.639.539.439.339.239.139.038.938.838.738.638.538.438.338.238.1